.shou{
    color: red;
    width: 500px;
    height: 500px;
    text-align: center;
    margin: auto;
    line-height: 500px;
    font-size: 80px;
}
.doc{
    color: red;
    width: 500px;
    height: 500px;
    text-align: center;
    margin: auto;
    line-height: 500px;
    font-size: 100px;
}